Crossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons
arXiv:1203.0540 · doi:10.1103/PhysRevLett.108.266601
Abstract
Suspended graphene nano-ribbons formed during current annealing of suspended graphene flakes have been investigated experimentally. Transport measurements show the opening of a transport gap around charge neutrality due to the formation of "Coulomb islands", coexisting with quantum Hall conductance plateaus appearing at moderate values of magnetic field . Upon increasing , the transport gap is rapidly suppressed, and is taken over by a much larger energy gap due to electronic correlations. Our observations show that suspended nano-ribbons allow the investigation of phenomena that could not so far be accessed in ribbons on SiO substrates.
5 pages and 5 figures, Accepted in Physical Review Letters
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